期刊
NUCLEAR ENGINEERING AND DESIGN
卷 313, 期 -, 页码 447-457出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.nucengdes.2016.12.038
关键词
CCFL; VOF method; Liquid film flow; Countercurrent annular flow; Steam generator; Numerical simulation
Countercurrent flow limitation (CCFL) in a heat transfer tube at a steam generator (SG) of pressurized water reactor (PWR) is one of the important issues on the core cooling under a loss of coolant accident (LOCA). In order to improve the prediction accuracy of the CCFL characteristics in numerical simulations using the volume of fluid (VOF) method with less computational cost, a thin liquid film flow in a countercurrent flow is modeled independently and is coupled with the VOF method. The CCFL characteristics is evaluated analytically in condition of a maximizing down-flow rate as a function of a void fraction or a liquid film thickness considering a critical thickness. Then, we have carried out numerical simulations of a countercurrent flow in a vertical tube so as to investigate the CCFL characteristics and compare them with the previous experimental results. As a result, it has been concluded that the effect of liquid film entrainment by upward gas flux will cause the difference in the experiments. (C) 2017 Elsevier B.V. All rights reserved.
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